Postman Proxy
A postman proxy routes your API requests through a middle server before they reach the backend. You set up this feature in the desktop app to inspect traffic or pass corporate firewalls. Engineering teams often use this setup to debug mobile apps or reach private networks. Still, broad network permissions and local API keys create security risks when teams share workspaces. Anyone with the shared workspace file can run destructive calls against live services. How a postman proxy works in local
Database Proxy (ProxySQL, PgBouncer): the complete guide
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A postman proxy routes your API requests through a middle server before they reach the backend. You set up this feature in the desktop app to inspect traffic or pass corporate firewalls. Engineering teams often use this setup to debug mobile apps or reach private networks. Still, broad network permissions and local API keys create security risks when teams share workspaces. Anyone with the shared workspace file can run destructive calls against live services.
How a postman proxy works in local setups
The desktop client acts as an intermediary between your local machine and the destination server. It operates in two main ways depending on your daily workflow. First, it can capture incoming traffic from an external device like a phone. Second, it can forward outgoing requests from the desktop app through a corporate network server.
When you capture traffic, the desktop tool listens on a specific local port. You point your mobile device or web browser to the IP address of your computer. As your phone sends HTTP requests, the desktop tool intercepts and logs each call. If you want to read encrypted HTTPS traffic, you must install a local trust certificate. Once the certificate is active, the client decrypts the request, records the payload, and forwards it. This helps developers see exact headers and payloads without changing the mobile app code.
In corporate networks, teams also use a forward routing setup to reach outside APIs. Many companies block direct internet traffic from developer laptops to protect internal systems. To get around this block, engineers point the desktop client to an internal corporate server. The desktop app sends the API request to that internal server first. The corporate server checks basic network rules and sends the request out to the internet.
What local routing solves and where it falls short
Using a local routing setup solves major visibility problems during early feature work. Developers can watch live API calls from a mobile client in real time. They can save those captured requests into collections to run repeatable tests later. Outbound routing also helps teams follow basic corporate firewall rules without using complex network tunnels.
Despite these benefits, local setups leave major security gaps when developers touch real data. A standard network server only checks which machine sends the traffic and where it goes. It decides who can connect to the network, not what individual API requests actually do. Once a developer has a valid API key in their workspace, they have full power. They can run delete commands or pull thousands of customer records at once.
Database Proxy (ProxySQL, PgBouncer): architecture patterns and best practices
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Sharing collections across a team makes this problem much worse. Engineers often save static tokens or admin keys inside shared workspace variables. When the desktop app sends a request, the backend only sees the shared service token. Audit logs cannot tell which specific person on the team clicked the send button. Also, response payloads often contain raw sensitive data. Emails, phone numbers, card numbers, and national IDs flow right onto the developer laptop. If a laptop is lost or a workspace syncs to the cloud, that data leaks.
Managing certificates and workspace credentials
Running HTTPS capture across a team requires constant upkeep of local security certificates. Every developer must generate a root certificate and add it to their system trust store. Mobile devices also need special trust settings enabled to accept the local certificate. If a developer forgets to remove this certificate later, it weakens their local device security. Pinned certificates in mobile apps also break this workflow and force engineers to disable security checks.
Handling credentials inside the desktop tool adds another layer of risk for security teams. Developers need valid tokens to test internal APIs, so they copy keys from production systems. These keys sit on local hard drives and stay active for weeks or months. Security teams have no simple way to revoke access for one single request. They also cannot mask emails or card numbers inside the JSON response before it lands locally.
Check database and API queries on the wire
Identity tools, roles, and network rules decide who opens a session. Setup alone cannot check what each query does or mask sensitive values in a response once a session starts. When workflows touch Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes APIs, SSH, or internal HTTP APIs, hoop.dev sits inline in the wire protocol beside those services as an open-source proxy, a sidecar for your Postgres or API. On every query an AI agent or engineer runs against production, hoop.dev decides to pass, mask, block, or hold it for human review.
Your login details and client tools stay as they are while hoop.dev guardrails refuse bad deletes or drops before they run, and hoop.dev data masking rewrites matched sensitive values in responses in memory. Furthermore, hoop.dev holds SOC 2 Type II, is MIT licensed, and writes every query and decision to an audit trail that generates evidence for HIPAA, GDPR, and PCI DSS. See the source on GitHub.
Frequently asked questions
How do I capture HTTPS traffic from a mobile app?
You must install the local root certificate from your desktop client onto your mobile device. Then you point your phone Wi-Fi settings to your computer IP address and listening port.
Why do my API requests fail with certificate errors?
Certificate errors happen when the client does not trust the local root certificate used for decryption. You need to trust the certificate in your operating system settings or turn off SSL checks.
Does a local routing setup hide sensitive data in API responses?
No, standard routing passes the full HTTP response directly back to the desktop client. Sensitive fields like emails, phone numbers, and card numbers stay visible in the local response body.